Mercator Fellow SFB-TR 87

Prof. Kushner visits research group Awakowicz

Mark Kushner confirmed his visit to the RUB from the 03.-07.06.2019. A workshop will take place on Monday (03.06.2019) with a talk from Mark as well as from AEPT, EP2, EP5, and TET. For organizing the workshop and the talks, we would ask every institute to present TWO talks on their research. Therefore, please send us a title for your talks until the 29.04.2019.

Title: Plasma Characterization and classification using the method of disturbed bilateral relations.

Abstract: The aim of this lecture-block is to provide a common basis for engineers, experimentalists, theoreticians and users of plasma sources. This will be done by presenting a plasma classification/characterization tool based on the many aspects of equilibrium departures in plasmas. This leitmotiv is chosen because non-equilibrium is the essential reason behind the success of high-tech plasmas physics. Plasmas can generate large fluxes of photons and radicals but these effluxes will create deviations from the equilibrium.

To find our way in the wilderness of plasma features and sources we will use the method of disturbed Bilateral Relations (dBR), which relates equilibrium disturbing to equilibrium restoring mechanisms. In that way it generates validity-criteria and predicts trends in the deviations from equilibrium. The basic idea of the dBR method is that “equilibrium” has many features, which can be described by specifying the underlying balances of (de)excitation ionization/recombination, absorption/emission etc.. Equilibrium-departure has also many aspects. This can be caused by the efflux of heat, photons and/or (charged) particles.

Several different types of plasmas will be dealt with in various case studies. The tight relation between the (simplified) theory and spectroscopy will be highlighted. Apart from passive spectroscopy (Optical Emission Spectroscopy) we will also give examples of active (laser) spectroscopy like Thomson scattering.

The use of complicated formulas is avoided; the number of equations will be limited.

1) Do, 27.​11.​2014:​ Spec­trosco­py Re­le­vant To­pics For In Situ Me­a­su­re­ment Of The VUV Ra­dia­ti­on Pro­du­ced In A Micro­wa­ve Plas­ma Di­sch­ar­ge - We will di­s­cuss in de­tail an ex­pe­ri­men­tal pro­ce­du­re, which is based upon re­cor­ding the fluo­res­cence light emit­ted by so­di­um sa­li­cy­la­te disks pla­ced at the tar­get po­si­ti­on. Basic spec­trosco­py is­su­es on vi­si­ble and VUV spec­trosco­py will be ad­dres­sed. Preli­mi­na­ry re­sults wil be pre­sen­ted.
2) Do, 4.​12.​2014:​ From Pho­ton Den­si­ty Rate Emit­ted In The Plas­ma To Ra­di­ant Flux At The Tar­get Sur­face. A Pri­mer In Ra­dia­ti­ve Trans­fer - We will di­s­cuss basic con­cepts of ra­dia­ti­ve trans­fer in a plas­ma, and we will apply them to the in­ter­pre­ta­ti­on of our VUV me­a­su­re­ment. We will also ad­dress the ba­sics of ab­sorp­ti­on spec­trosco­py using mo­no­ch­ro­ma­tic beams.
3) Do, 11.​12.​2014:​ The Re­la­ti­ve And Ab­so­lu­te Ca­li­b­ra­ti­on Pro­ce­du­re For A VUV And Echel­le Spec­tro­me­ters Using The Tech­ni­ques That Are Re­gu­lar­ly Ap­p­lied At The AEPT In­sti­tu­te - We will out­li­ne the ge­ne­ral basic is­su­es of the re­la­ti­ve ca­li­b­ra­ti­on of a mo­dern com­pact vi­si­ble spec­tro­me­ter. We will di­s­cuss the re­la­ti­ve ca­li­b­ra­ti­on pro­ce­du­re of a VUV and echel­le spec­tro­me­ters. A basic tech­ni­que of ab­so­lu­te ca­li­b­ra­ti­on of an echel­le spec­tro­me­ter will be pre­sen­ted also.